A wind tunnel experiment on the evaporation rate of Class A evaporation pan

Chia Ren Chu, Ming Hsu Li, Yi Ying Chen, Yi Hsin Kuo

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


The influences of wind speed and water depth on the evaporation rates of Class A evaporimeter pan were investigated in a series of wind tunnel experiments. Based on the measured pan evaporation rates, the aerodynamic resistance for the evaporimeter pan was calculated and integrated with a Penman-Monteith type model for pan evaporation rate. The experimental results also demonstrated that the evaporation rate of evaporimeter pan will be influenced by the water depth when the water depth is much smaller than the standard water depth h = 20 cm, due to the shelter effect of the rim of the pan. In addition, it was observed that the wind could blow water over the edges of the pan when wind speed U exceeds 7.0 m s-1. Namely, the water loss from the pan is not entirely due to evaporation and the evaporation rates could be over-estimated at high wind speeds.

Original languageEnglish
Pages (from-to)221-224
Number of pages4
JournalJournal of Hydrology
Issue number3-4
StatePublished - 15 Feb 2010


  • Aerodynamic resistance
  • Evaporation pan
  • Wind speed
  • Wind tunnel experiment


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